Improvement in molds for stereotypes



ilnitrxl (gist-ra @wat (Itjijlw.

Moerman NELSON,

or NnWYoRK, N. .Y.

Letters Patent No. 102,304, dated April 26 1870.: antedaterl April18,1870.

vIMPRovsimian* m'monns ron STERQTYPBS.

The ahedule referred to in than Lettori Paten: and making part of thelaine.

To all whom it may concern.: i

Be it known that I, Moarmnn NELSON, of. the city and Stateof New York,have invented'and made a. new and useful Improvement in Molds forStereof f types; and I do hereby declare the following to be.- a

full, clear, and exact vdescription of tbe nature ofthe said'invention,reference being had to the annexed Y drawing making part of thisspecification, wherein- 'L Figure 1 is a section showing the form oftypes and Vthe manner of taking the impression or mold. Figure 2 isapartial vertical section, and

IFigure 3, a sectional planof ,the mold employed by I accomplish theseobjects by the use of a woven or knitted fabric coated with acomposition impressed' fgnpon tbe types to produce the matrix, and Ithen. inf sert the same ina mold provided with non-conducting material,so that the metal does not chill, butperi'ectly fills the interstices ofthe matrix.

I make use of a fabric such as Canton-flannel, and coat the same with acomposition, either by a brush or 'by dipping, the former preferred. Thecomposition enters into the surface, and the projecting fibers becomethe means for holding all particles ofthe com-v position, so that thematrix will 'separate fromv the types and none of the pieces of theszrompostionlI-emain upon upon'the surface of the types. Y

The composition I employ is madel of Paris white, well boiled our pastemixed to the consistency of cream, and the white of an egg, introducedinto about five pounds of such composition; the same is thoroughly mixedand applied as aforesaid, and allowed to dry, or nearly so.' f

NVhen the matrix is to be made the sheet should be' damp; this may beeffected by the use ot' a sponge, and water applied to the back of thefabric. I also prefer to rub plnmbago upon the surface of the fabricprepared as aforesaid.

. .lhe matrix is made by laying a piece of said fabric upon theface ofthe types, then a sheet of India rubber or other elastic mateiial, andsubjecting the same to pressure in a suitable press, which indent-s thefabric between the types and ltakes a perfect impression of the faces ofthe types, inthe composition upon the surface of said fabric.

ashows the types; b, the sheet of prepared fabric; c, the sheet of Indiarubber; and

d, the pressfollower, or platen.V

. After the fabric 'hasbeen pressed' upon the types, the matrix is to bedried by a heated plate or sad-iron passed over the back surface; thematrix may then v be removed and it .will be found to 'separate freelyand perfectly from the facesof'the types. I remark that the faces of thetypes should be oiled, as,.usual, previous to pressing the sheet ofprepared fabricupon them.

In places where there are blank spaces between the or a strip lofthick-paper, .ora piece of such thick paper, to prevent the pressure ofthe melted metal forcblank spaces. v

The mold in which the stereotype is cast is formed of the plates ,fandg; the:p1ate f is fitted with hinged clamps h, thatcan 'be swung aroundto clamp the plate g, and the plate g is beveled, as seen in fig. 2, to

. form a mouth for receiving the melted metal.

The plates fand g, but especiallythe plate g, should be kept heated, andupon this the stereotype-matrix b is laid, and upon the edges of'it aframe of pasteboard, t', is placed, of a size to surround three sidesresponding to the thickness' of vthe stereotype-plate.

The platefis lined with a sheet of pasteboard or similar non-conductork,`in order that the type-metal, when poured in between the matrix b andsheet k, may remain in a fluid state and not quickly become chilled orset; thereby a perfect cast will be obtained.

The edges of the stereotype-plate will require to be sawed off, asusual. stereotypes made in this manner are very perfect, and'requirelittle or no pickingjor chiseling.

The types are not injured, as frequently happens in the ordinary way offorming the matrix; very little vtime is required, andthe matrix can belaid aside for lfuture use or reference if necessary.

ployed in forming the matrix, the same being pasted together before orduring the .process of forming the .matr-ix. I claim as 1nyinveut1on f Asheet of woven material, such as Oauton-iiannel, prepared by a coatingupon its surface, for use in making stereotype-molds by pressure,- thesaid coating forming the surface of the matrix, and that isvpreventedfrom separating bythe bers of the woven fab- `ric running throughout thecomposition, as set forth.

In witness whereof, I-have hereunto set myl signature this 29th day ofJuly, A.'D. 1869.

' M. NELSON. Witnesses:

' Geo. BENNETT WALKER,

Gao. T, PlNcKNEY.

-lines or sections of types, I prefer tointroduce a eord ing.the fabricback near the middle of these large ,v

o f the page or column-matrix, and of 'a thickness cor-y I am aware thatsheets `of paper liavc been emv

